Start the game with the one of the following command line parameters to activate the corresponding cheat function.

Effect	Command line parameter
Debug mode	-debug
Disable sounds	-nosound
Level select	-warp [episode,level number]
Load external resource file	-file [filename]
Play a recorded demo	-play [filename]
Record a demo	-record [filename]
Skill level select	-skill [skill level 0-3]